d&b audiotechnik 40D, Reference Manual

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Intended use
The d&b 40D amplifier is designed for installation purposes and is
intended to be used with applicable d&b loudspeakers.
A "LINEAR" setup is available allowing the amplifier to be used as
a linear installation power amplifier.
Note: d&b audiotechnik will accept no liability for any
damages to third-party loudspeakers when operated with d&b
amplifiers in "LINEAR" mode.
NOTICE!
The device complies with the electromagnetic compatibility
requirements of EN 55032:2019 (product family standard for
audio, video, audio-visual and entertainment lighting control
apparatus for professional use) for the environment Class B
(residential).
Acoustic interference and malfunctions may occur if the unit is
operated in the immediate vicinity of high-frequency transmitters
(e.g. wireless microphones, mobile phones, etc.). Damage to the
device is unlikely, but cannot be excluded.
1.1 Loudspeaker types
The maximum number of cabinets driven by each channel varies
depending on their nominal impedance. It can be found in the
respective loudspeaker manual and also in the data section of
each loudspeaker product page on the d&b website at
www.dbaudio.com .
The minimum recommended impedance per channel is 4 ohms.
Nom. impedance Cabinets per channel
4 Ω 1
8 Ω 2
12 Ω 3
16 Ω 4
20 Ω 5
A list of d&b loudspeakers supported by the amplifier is included in
the Release notes of the amplifier firmware. The latest version can
be found on the d&b website at www.dbaudio.com .
1 Intended use
d&b 40D Reference manual 1.3 en 5